Piotr Daniszewski, Ryszard Konieczny, Evaluation of Chemical and Physico-Chemical Indicators of Water and Bottom Macrofauna the Resko Lake on the Basis of the European Union Water Framework Directive, Volume 10, International Letters of Chemistry, Physics and Astronomy (Volume 10)
https://www.scipress.com/ILCPA.10.86
Abstract:
    Have studied lake close to neutral pH – 7.67 to 7.73. All lakes in accordance with the classification of the European Union Water Framework Directive have been included in the first class.The concentration in the surface layer of P<sub>tot</sub>. Lake is little differentiated, is at level II quality class according to the classification of the European Union Water Framework Directive. Tested water lakes were changing the concentration of the PO<sub>4</sub><sup>3-</sup>s<sub>diss</sub> - these concentrations correspond to water quality from III. The increase of the concentrations of phosphorus in the Lake may indicate a decrease in the amount of oxygen in the waters of the shallow and changes their status to release phosphorus compounds accumulated redox in sediment bottom. In the case of nitrogen-compounds nitrates and nitrites values for these indicators were at level I and II class in all the surveyed lakes in accordance with the classification of the European Union Water Framework Directive. Indicator, which indicates the high productivity of Lake is the biochemical oxygen demand (BOD<sub>5</sub>). The level of this indicator values on the studied Lake was on level III class. In the remaining Lake oxygen concentration was similar (continued in I class). Fauna of the Resko Lake bottom during summer stagnation was poor in terms of quality, which proves its considerable biological degradation. In terms of the concentration in the test macrozoobenthos Lake dominated, and Oligochaeta, Diptera larvae.
Keywords:
    Chemical and Physico-Chemical Indicators, European Union Water Framework Directive, Lake, Macrozoobenthos, Water